Packing list 1*Cushion This seat cushion for the office chair needs not any manual pump like others. PEFECT PAIN RELIEF FOR HIPS, SCIATICA, LEGS, and LOWER BACK - The internal air will flow between air cells according to different hip types and sitting posture to avoid 180 flat sitting status, effectively increase the contact area, reduce the hip wai st pressure, provide great supports recovery from lower back problems, sciatica, herniated discs, tailbone injuries, and other spinal issues. Bullet points: 1. The 3D airbag design of the seat cushion can provide 30% stress relief for your hips. 2. Sit for a long time without feeling tired. It is an ideal cushion for studying in the office, school or home, driving or playing games at home. 3. The shallow groove design makes the air cushion ventilate. Then, it can keep your hips at a normal 26C-28C, which is different from the usual cushions, the temperature will rise when sitting for a long time. 4. 3D three-dimensional airbag design can disperse the pressure between the bottom and the object. The internal air will flow according to your sitting posture, and then the cushion will better fit your bottom. 5. Non-inflatable cushion. It is very soft and you will feel comfortable. Descriptions: Material: Polyurethane Elastic Fiber (Spandex) Size: 45*45*2cm (17.7*17.7*0.8inch)